Sensing amplifier and trip circuit particularly for ground...

Details Sensing amplifier and trip circuit particularly for ground... Sensing amplifier and trip circuit particularly for ground...

H - Electricity

02

H

330/21, 348/26

H02H 3/28 (2006.01) H02H 3/33 (2006.01)

Patent

CA 1044795

SENSING AMPLIFIER AND TRIP CIRCUIT PARTICULARLY FOR GROUND FAULT CIRCUIT INTERRUPTER Abstract of the Disclosure Ground fault interrupter apparatus of the differential transformer type is provided with a sensing amplifier and trip circuit that includes an operational amplifier operated in a manner so that the interrupter apparatus is less sensitive to capacitive ground faults than it is to resistive ground faults. The quality of less sensitivity to capacitive ground faults is preferably obtained by applying to the operational amplifier a biasing voltage that is a half-wave rectified, unfiltered, voltage which aids in maintaining the inputs to the operational amplifier as a pure current source while using only a small number of components that is advantageous for reduced size.

183378

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